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In your first post you bake object illumination and correct map was created, but didn´t see in viewport. Question is, where is placed light object, because if it is behind cube, cube was enlighted from back to front of camera and we see correct result (and non black parts are "behind" object and non visible for us). Check material applied on baked cube if contain same looking material as in bake preview and/or rotate cube...

If all previous was ok, then once more check material of contain baked illumination, because if I look in your screenshot, path is wrong/non complete. Set absolute path and check result again...